Add a PoC of simple ebuild parser (WIP)

pkg/tree/builder/gentoo/simpleparser.go

@@ -0,0 +1,51 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package gentoo
+
+// NOTE: Look here as an example of the builder definition executor
+// https://gist.github.com/adnaan/6ca68c7985c6f851def3
+
+import (
+	"errors"
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	pkg "github.com/mudler/luet/pkg/package"
+)
+
+// SimpleEbuildParser ignores USE flags and generates just 1-1 package
+type SimpleEbuildParser struct {
+}
+
+// ScanEbuild returns a list of packages (always one with SimpleEbuildParser) decoded from an ebuild.
+func (ep *SimpleEbuildParser) ScanEbuild(path string) ([]pkg.Package, error) {
+
+	file := filepath.Base(path)
+	file = strings.Replace(file, ".ebuild", "", -1)
+
+	decodepackage, err := regexp.Compile(`^([<>]?=?)((([^\/]+)\/)?(?U)(\S+))(-(\d+(\.\d+)*[a-z]?(_(alpha|beta|pre|rc|p)\d*)*(-r\d+)?))?$`)
+	if err != nil {
+		return []pkg.Package{}, errors.New("Invalid regex")
+
+	}
+	packageInfo := decodepackage.FindAllStringSubmatch(file, -1)
+	if len(packageInfo) != 1 || len(packageInfo[0]) != 12 {
+		return []pkg.Package{}, errors.New("Failed decoding ebuild: " + path)
+	}
+	//TODO: Deps and conflicts
+	return []pkg.Package{&pkg.DefaultPackage{Name: packageInfo[0][2], Version: packageInfo[0][7]}}, nil
+}

pkg/tree/builder/gentoo/simpleparser_test.go

@@ -0,0 +1,43 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package gentoo_test
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	. "github.com/mudler/luet/pkg/tree/builder/gentoo"
+)
+
+var _ = Describe("GentooBuilder", func() {
+
+	Context("Simple test", func() {
+		It("parses correctly deps", func() {
+			gb := NewGentooBuilder(&SimpleEbuildParser{})
+			tree, err := gb.Generate("../../../../tests/fixtures/overlay")
+			Expect(err).ToNot(HaveOccurred())
+			Expect(len(tree.GetPackageSet().GetPackages())).To(Equal(10))
+
+			for _, p := range tree.GetPackageSet().GetPackages() {
+				Expect(p.GetName()).To(ContainSubstring("pinentry"))
+				Expect(p.GetVersion()).To(ContainSubstring("1."))
+
+			}
+
+		})
+	})
+
+})